62 lines
2.0 KiB
C
62 lines
2.0 KiB
C
/* 17 july 2014 */
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#include "winapi_windows.h"
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#include "_cgo_export.h"
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BOOL baseUnitsCalculated = FALSE;
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int baseX;
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int baseY;
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/* called by newWindow() so we can calculate base units when we have a window */
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void calculateBaseUnits(HWND hwnd)
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{
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HDC dc;
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HFONT prevFont;
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TEXTMETRICW tm;
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if (baseUnitsCalculated)
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return;
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dc = GetDC(hwnd);
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if (dc == NULL)
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xpanic("error getting DC for preferred size calculations", GetLastError());
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prevFont = (HFONT) SelectObject(dc, controlFont);
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if (prevFont == NULL)
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xpanic("error loading control font into device context for preferred size calculation", GetLastError());
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if (GetTextMetricsW(dc, &tm) == 0)
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xpanic("error getting text metrics for preferred size calculations", GetLastError());
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baseX = (int) tm.tmAveCharWidth; /* TODO not optimal; third reference below has better way */
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baseY = (int) tm.tmHeight;
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if (SelectObject(dc, prevFont) != controlFont)
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xpanic("error restoring previous font into device context after preferred size calculations", GetLastError());
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if (ReleaseDC(hwnd, dc) == 0)
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xpanic("error releasing DC for preferred size calculations", GetLastError());
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baseUnitsCalculated = TRUE;
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}
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void moveWindow(HWND hwnd, int x, int y, int width, int height)
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{
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if (MoveWindow(hwnd, x, y, width, height, TRUE) == 0)
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xpanic("error setting window/control rect", GetLastError());
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}
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LONG controlTextLength(HWND hwnd, LPWSTR text)
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{
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HDC dc;
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HFONT prev;
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SIZE size;
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dc = GetDC(hwnd);
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if (dc == NULL)
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xpanic("error getting DC of control for text length", GetLastError());
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prev = SelectObject(dc, controlFont);
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if (prev == NULL)
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xpanic("error setting control font to DC for text length", GetLastError());
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if (GetTextExtentPoint32W(dc, text, wcslen(text), &size) == 0)
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xpanic("error actually getting text length", GetLastError());
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if (SelectObject(dc, prev) != controlFont)
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xpanic("error restoring previous control font to DC for text length", GetLastError());
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if (ReleaseDC(hwnd, dc) == 0)
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xpanic("error releasing DC of control for text length", GetLastError());
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return size.cx;
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}
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